فهرس المقالات Morphometric Indices

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  1 - Morphotectonics investigations of the Garehbagh basin area based on morphometric indices, NW Iran
  Hassan Haji Hosseinlou
  Morphotectonic investigations were carried out by the use of morphometric indices which serve as a tool of identification in regions with active tectonic warp. Landforms in active deformation area are produced from relations of tectonic and surficial processes. One of t أکثر

  Morphotectonic investigations were carried out by the use of morphometric indices which serve as a tool of identification in regions with active tectonic warp. Landforms in active deformation area are produced from relations of tectonic and surficial processes. One of the most significant landforms underground is rivers that are extremely responsive to tectonic movements mainly uplift and tilting. Accordingly, based on investigation of the rivers and interrelated drainage networks by the use of morphometric indices, we will be able to achieve valuable information about tectonic record of the study area. In this study, in order to find out the tectonic activities of the study area, geomorphic indices were surveyed in Garehbagh basin. In order to determine tectonic movement of Garehbagh basin area, six different morphometric indices including Mountain Front Sinuosity (Smf), Valley Floor Width to Height Ratio (Vf), Index of drainage basin shape (Bs), Stream Length Gradient Index (Sl), Hypsometric integral (Hi), Drainage basin asymmetry (Af) were applied to the study area. According to generated results, SL values change between Smf value according to generated outcome; the most active mountain fronts faults of the study area.. Deep and narrow valleys show low Vf values <1.0, these valleys can be classified as V-shaped valleys and Vf values between 1 and 1.5 indicate moderately active regions and Vf values greater than 1.0 can be classified as ―U‖ shaped valleys. According to generated outcome, in the study area, the Hi value is 0.86. High values of the hypsometric integral specify deep incision and rugged relief. Intermediate low values of the integral are related with more evenly dissected drainage basins. Asymmetry factor extensively greater than 50 suggest tectonic tilt.Results from the analysis are accumulated and expressed as an index of relative active tectonics (Iat), which is divided into one class from relatively high tectonic activity. The study area relatively high rates of active tectonics are associated with indicative values of Iat. تفاصيل المقالة
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  2 - Investigation of the relationship between tectonic morphological indices and seismic acceleration in Indes, Aipak, Avaj and Kushk-e-Nusrat fault zones (northwest of Saveh)
  Bahar Rezaei Nahal Mohsen PourKermani Mehdy Zare Maryam Dehbozorgi Reza Nozaem
  10.30495/jrors.2023.1975789.1170
  The northwest zone of Saveh city is located in the Indes , Kooshk e Nosrat, Avaj and Ipak fault zones. Indes, Kooshk e Nosrat, Avaj and Ipak faults are considered as the major faults in central Iran, which are also active in the Quaternary and the their last movements a أکثر

  The northwest zone of Saveh city is located in the Indes , Kooshk e Nosrat, Avaj and Ipak fault zones. Indes, Kooshk e Nosrat, Avaj and Ipak faults are considered as the major faults in central Iran, which are also active in the Quaternary and the their last movements are attributed to the present time, therefore, the estimation of morphometry in order to identify the effect of active tectonics on the tectonic evolution of drainage basins seems necessary. Therefore, in this study, six important morphotectonic indices were analyzed including longitudinal gradient of the river, asymmetry of drainage basin, hypsometric integral, Drainage basin shape, the ratio of the floor width to the valley height and mountain front. In order to model the formation of basins in the studied area, Arc Hydro software (Arc GIS add ins) has been used based on data derived from a digital elevation model. Then, 6 morphotectonic indices have been compiled and classified on each of the basins. Finally the Active Tectonic Index (IAT) has been calculated, according to which the study area has been classified into 4 categories including very high, high, intermediate and low tectonic activity. According to the IAT index, 5% of the study area shows very high tectonic activity, 25% of the studied area has high tectonic activity, 65% of it has the average tectonic activity and about 5% of the tectonic activity are low. In this study, the highest level of tectonic activity can be seen in the north-eastern part of the area. In most sectors, the level of activity is high and intermediate, which is related to the activity of Kooshk-e-Nosrat, Aipak and Avaj faults.The northwest zone of Saveh city is located in the Indes , Kooshk e Nosrat, Avaj and Ipak fault zones. Indes, Kooshk e Nosrat, Avaj and Ipak faults are considered as the major faults in central Iran, which are also active in the Quaternary and the their last movements are attributed to the present time, therefore, the estimation of morphometry in order to identify the effect of active tectonics on the tectonic evolution of drainage basins seems necessary. Therefore, in this study, six important morphotectonic indices were analyzed including longitudinal gradient of the river, asymmetry of drainage basin, hypsometric integral, Drainage basin shape, the ratio of the floor width to the valley height and mountain front. In order to model the formation of basins in the studied area, Arc Hydro software (Arc GIS add ins) has been used based on data derived from a digital elevation model. Then, 6 morphotectonic indices have been compiled and classified on each of the basins. Finally the Active Tectonic Index (IAT) has been calculated, according to which the study area has been classified into 4 categories including very high, high, intermediate and low tectonic activity. According to the IAT index, 5% of the study area shows very high tectonic activity, 25% of the studied area has high tectonic activity, 65% of it has the average tectonic activity and about 5% of the tectonic activity are low. In this study, the highest level of tectonic activity can be seen in the north-eastern part of the area. In most sectors, the level of activity is high and intermediate, which is related to the activity of Kooshk-e-Nosrat, Aipak and Avaj faults. تفاصيل المقالة
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  3 - Morphotectonic Analysis of the Babakouhi Anticline North of Shiraz
  قدرت الله فرهودی Hasti Sharafi
  In this research it was tried to use field work, geomorphic indices such as mountain front faceting (Facet %), mountain front sinuosity (Smf), ratio of valley floor width to valley height (Vf), the study of air photos and processing of satellite images and detecting and أکثر

  In this research it was tried to use field work, geomorphic indices such as mountain front faceting (Facet %), mountain front sinuosity (Smf), ratio of valley floor width to valley height (Vf), the study of air photos and processing of satellite images and detecting and enhancing of lineaments, using different remote sensing methods, to answer ambiguities regarding Babakouhi anticline and factors affecting the morphotectonic situation of the area. This research shows that the pressure caused by Sabzpooshan strike slip - dextral fault with NW-SE trend and Bamu Strike slip - dextral fault with SW-NE trend have had great impact on the deformation of the area such as changes in anticline trend, creation of main faults of the area and creation of the university hill anticline. Anticline; Zagros; Folded - faulted zone; Geomorphometric indices; Strike slip - dextral fault. تفاصيل المقالة